Catherine Diamond, MD
NPI 1649350786 · Infectious Disease Physician · Orange, CA
Enrolled with Medicare as Practitioner - Internal Medicine · source: CMS PECOS Public Provider Enrollment (2026.04.01)
Catherine Diamond, MD is a Infectious Disease Physician provider in Orange, CA (NPI 1649350786).
Provider details
- NPI number
- 1649350786
- Entity type
- Individual
- Primary specialty
- Infectious Disease PhysicianAllopathic & Osteopathic Physicians
- Credential
- MD
- Sex
- Female
- Sole proprietor
- No
- License
- 000000G84863 (CA)
Specialties & taxonomies
Allopathic & Osteopathic Physicians
Profile Score
A profile completeness & documented-activity index — NOT a quality, outcomes, or patient-satisfaction rating.
- Registry tenure28% of score
19 yrs in NPPES registry
- Profile completeness28% of score
100% of core fields populated
- Practice footprint17% of score
1 documented practice location
- Medicare service volume (vs. specialty peers)28% of score
442 Medicare services, 2024 (ranked within specialty)
Medicare volume is ranked against active providers in the same specialty. Signals a provider has no public data for (e.g. Medicare claims) are left out of the score entirely — never counted as zero — so providers without that data are not penalized. See the full formula and weights in our methodology.
What this provider does (Medicare)
Based on Medicare fee-for-service claims, 2024; not all care is captured.
| Service (HCPCS) | Medicare services | Typical Medicare-allowed (2024) |
|---|---|---|
| Established Patient Office Or Other Outpatient Visit With Moderate Level of Decision Making, If Using Time, 30 Minutes Or More99214 | 234 | $106 |
| Initial Hospital Care With Straightforward Or Low-Level Medical Decision Making, If Using Time, at Least 55 Minutes99222 | 52 | $143 |
| Subsequent Hospital Care With Moderate Levelof Medical Decision Making, If Using Time, at Least 50 Minutes99233 | 50 | $130 |
| Visit Complexity Inherent to Evaluation and Management Associated With Medical Care Services That Serve As the Continuing Focal Point for All Needed Health Care Services And/Or With Medical Care Services That Are Part of Ongoing Care Related to a Patient'SG2211 | 48 | $18 |
| Telephone Medical Discussion With Physician, 21-30 Minutes99443 | 42 | $107 |
| Telephone, Internet, Or Electronic Health Record Assessment and Management With Written Report By Consulting Physician, at Least 5 Minutes |
What this provider prescribes (Medicare Part D)
Top drugs by Medicare Part D claim volume, 2024 · 117 distinct drugs on file.
| Drug | Part D claims (2024) | Beneficiaries |
|---|---|---|
| Bictegrav/Emtricit/Tenofov Alabrand: Biktarvy | 549 | 54 |
| Atorvastatin Calcium | 285 | 40 |
| Gabapentin | 135 | 16 |
| Darunavir/Cob/Emtri/Tenof Alafbrand: Symtuza | 133 | 16 |
| Amlodipine Besylate | 131 | 12 |
| Omeprazole | 130 | 15 |
| Dolutegravir Sodium/Lamivudine |
Practice location
Mailing address
Registry dates
- Enumerated
- 2006-10-16
- Last updated
- 2008-04-08
Frequently asked questions
- What is Catherine Diamond's NPI number?
- Catherine Diamond's National Provider Identifier (NPI) is 1649350786, a unique 10-digit ID issued by CMS for use in standard healthcare transactions.
- What is Catherine Diamond's specialty?
- Catherine Diamond is listed in the NPPES registry with a primary specialty of Infectious Disease Physician (Allopathic & Osteopathic Physicians).
- Where is Catherine Diamond located?
- Catherine Diamond's practice location on file with NPPES is Uci Medical Center, Orange, CA 92868.
- What is Catherine Diamond's phone number?
- The practice phone number listed in the NPPES registry for Catherine Diamond is (714) 456-8978.
- Does Catherine Diamond accept Medicare?
- Catherine Diamond is approved to bill Medicare according to CMS PECOS enrollment data (2026.04.01). Confirm current participation with the provider before scheduling.
- Is Catherine Diamond's NPI active?
- Yes — Catherine Diamond's NPI (1649350786) is active in the NPPES registry as of the last update on 2008-04-08.
Source: CMS NPPES Data Dissemination (June 2026). NPI Central is not affiliated with CMS. Data is provided as-is from the public registry.